| 摘要 |
A receptacle type GFCI includes an input circuit, a leakage current detecting and amplifying circuit, a neutral ground fault detecting and amplifying circuit, a signal control circuit including an IC and a reset and trip actuating circuit, an output circuit, and a ground fault self detecting circuit connected between the input circuit and the reset and trip actuating circuit. The ground fault self detecting circuit is used to test, when the power is turned on for the first time under correct wiring or when the TEST button is pressed after the RESET button is pressed, whether the ground fault protection function of the GFCI is working properly. The ground fault self detecting circuit includes an end-of-life indicator.
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